Precision dressing apparatus for grinding wheels



Dec. 9,-1930. G. WEIDNER 1,784,261

PRECISION DRESSING APPARATUS FOR GRINDING WHEELS Filed June 28. 1929 I 5 SheetsSheet l r fi I I I I I 1 1 I I I I I l J I I N I I I I I I I I I J I I"\I $2, I 1% & O 3 II J I- 0 I i 1 7x: 7 QI I I a;

t I I In INVENTOR I GEO/165 h/E/m/ER ATTORNEY Dec. 9, 1930. G. WEIDNER 1,734,261

PRECISION DRESSING APPARATUS FOR GRINDING WHEELS Filed June 28, 1929 3 Sheets-Sheet 2 Illlll IIIIIIII'iI II l INVENIOR GEORGE h/Em/vER ATTORN EY Patented 9, 1930 UNITED STATES amine]: wmnnnn, or nocnnsrnn, nnwaonx PRECISION DRESSING APPARATUS 1'33 GRINDING WHEELS Application filed June as. 1929. Serial 110. 374,510:

This invention relates to apparatus for dressing grinding wheels and has for its various objects: .1

To provide-an apparatus with which the 6 dressing operation on a grinding wheel can be done with precision.

To provide an apparatus wit which a grinding wheel can be dressed to pro 'de any desired angle thereon.

1 To provide an a paratus with which the' ll of this turn table is provided with a dependgrinding wheel can e dressed concave as we as convex. I To provide an apparatus for dressing grinding wheels in which all of at moving parts are roteoted from the abrasive dust liberated rom the grinding wheel during the dressing operation. z All these and other objects of this invention will be apparent from the drawings, the specification and the appended claims forming a part thereof.

In the accompanying drawings: 3

Figure 1 is a side elevation of the precision dressing apparatus for grinding wheels.

Figure 2 is a top plan viewof the apparatus. p i Figure 3 is an end elvationof the apparatus with portions of itbroken away m order to illustrate parts of the mechanism 0 the apparatus in section.

3 Figure 4 is .a horizontal sectional view of the movable diamond holder and its guide member, the section being taken on the line 4w4w of Figure 3. v v a Figure 5 is a vertical sectional view of the 1 diamond holder and its guide member, the

section being taken on the line 5w-5w of Fi re4. the several figures of the drawings like reference numerals indicate like parts. L The dressin vapparatus forming the subect matter 0 this invention is especially adapted for precision work, and dresses the face of a grinding wheel angular-1y at any desired angle and convex or concave with any desired radius. g

The apparatus has a supporting base 1 which is adapted to est on the magnet table of the grinder and is held in place thereon by the magnetic force of the magnets thereject below the surface of the base and engage f turntable 4 and on top of the turntable is of. Gauge pins 2, 2 one near each corner oi the base 1, are provided for the purpose of lining up the apparatus on the table. These pins are depressed until their lower ends prothe edge of the table to position the base 1 with relation thereto. The center'of the sup- 7 porting base has a short truncated conical elevation 3 on top of which is' mounted to rotate the circular turn table 4. The bottom ing concentric shoulder 5 and a central cylindrical pivot member 6 which project into the cylindrical depression 7 and central cylindrical hole 8 respectively to pivotally mount the turn table 4 on the sup ortingbase 1. The turn table is held to the ase-by the bolt 9 which is threaded into the center of the I cylindrical pivot member with its flat head 10 overhanging the bottom of the pivot member thus forming a shoulder on the pivot member which will lock the turntable to the base. In the top of the base 1 is provided the cylindrical dovetailed slot 11. This slot is concentric with the pivot member and into it extends the head 12 of the clamping screw 13." As illustrated in Figure 1 the shank of the clamping screw pro]ects thru a hole in the threaded thereto the clamping head 14. "The clamping head has a handle 15 by means. of which it can be turned. When the clamping head is turned, the clamping screw, 13 is threaded into it and draws the turntable down onto the base and'firmly clamps the'85 turntable against rotation thereon.

Provided on top of the turn table 4 are the two bearing blocks 16: and 17 forming a trunnion bearing in which are mounted to turn; the trunnion bearing pins 18 and 19 of the trunnion block 20. The trunnion pins project from each side of the'trunnion block and are-held in place therein. by a drive fit in the block. Within the trunnion block and between the inner ends of the trunnion pins is provided a space21 in which a pair of-bevel pinions 22 and 23 are located. Of these, bevel pinion 23 is keyed to the shaft 24 which is mounted to rotate in a central bearing provided in, each of the ion for the upper reduced end of the spindle 32.

trunnion pins 18 and 19, The hand wheel l'.OllOW guide sleeve and when the nut is 25 is keyed to the portion of the shaft prothreaded up or down on the spindle the conjecting from one of the trunnion pins so necting lug, carried by it, operates to turn that the shaft 24 and with it the bevel pinion the protecting sleeve in either one or the 23 may be rotated therewith. The shaft 24 other direction. As illustrated in Figure 5 is held against endwise movement in the the connecting lug 36 completely fills the bearings provided in the trunnion pins by portion of the helical slot which crosses the the shoulder formed by the hub of the hand straight slot of the hollow guide member wheel 25'on the outside of the trunnion bear- 28. Except for this portion of the helical ing and by the shoulder formed by the colslot which is closed by the connecting lug lar located at the back of the bevel pinion the wall of the protecting sleeve closes the 23 within the trunnion block 20. straight guide slot in the hollow guide menr The trunnion block 20 is provided With her above and below the diamond holder a radial hollow boss 27 in which is anchored and due to the fact that the protecting sleeve the reduced end of the hollow guide memrotates as the diamond holder moves up or her 28. The portion of this guide member down, the guide slot is kept closed at all projecting from the boss 27 is rectangula times whether the'diamond holder is inorin cross section except for the Ou e end ing or is held stationary in any position on thereof which is cylindrical and has 3. male the hollow guide n ember; In this way the thread provided thereon to allow the cap threaded spindle within the hollow guide 30 to be threaded thereon. Centrally of the member is constantly protected from the cap on the inside thereof is formed e ylinabrasive dust that is cut from the grinding drical pocket 31 which serves as the bearing h ld ri th d i Operation As illustrated in section in Figure 3 the The lower end of this spindle iS moun e t0 nut 34 is grooved in the middle and in this rotate in the lower portion of the hollow ro ve on one side of thespindle 32 is l() guide member 28 thru which it passes and gated th la i h 45 whi h i to the end of it is threaded Otherwlse vided at the inner end of the clamping screw suitably keyed the bBVGl pinion COlliLl' The clamping scre v passes thru a 11910 33 provided intermedi of the spindle in the connecting lug 36 and cover plate 37 in conjunction with the reduce upp r end and has threaded thereto on the outside of 31 of the spindle mounted to rotate in the th cover l t th th b t 41 3 mtcap 30, holds the spin g in w ing this thumb nut in one direction the movement Within the hollow gulde member clamping screw may thus be moved to draw 28. the clamping shoe against the inside of the The thread Provided Oh the splhdie 32, protecting sleeve 40 to clamp the nut against Preferably Square and Oh it is threaded the the sleeve and prevent any further movement 1111i? This hut forms P of m l of the nut either up or down within the holder Of the diamond and 'fI'OHl ll hollow guide me nben A rotation of the j t th l ngat d connecting lug 3 thumb nut in the opposite direction on the which connects the nut with the cover plate th h d ill release thg l i h 37 of the movable d o hOidel The and permit the movement of the diamond sides of the lug are helical in order to engage h ld i h up or down the helical slot 39 provided in the cylindrical Protecting Sleeve 40 which su-Tlouhds the hut the diamond holder has inserted between two 34 and eXtelids the full 1Bhgth h h of its inner walls and the opposite outside threaded Portion of the spmdle 32 wlthln walls of the guide member the bow springs 50 the hou9w gmde member. T lug pm 51. Thesebow springs have a small lug also .proiegts thru h Stralght gulde slohtfl on their convex side and these lugs engage Provlded One slde of the hollow gulde suitable holes in the wall of the diamond member 28. The enga ement of the lu 36 with the straight guidz slot serves to hold holder and thus anchor the spungs m a pm the nut against rotation so that when the spindle 32 is rotated the nut 34 will be so that the pressure exerted by them will threaded up or down thereon and this movekeep the opposlte Walls of the diamond holder 4 and thehollow guide member in frictional 223 5 22 i zfi i i g ig g ggg g i sfig 38 2 contact with each other and hold thediamond guide member and in turn holds the diaholder to a P y Straight v e 0h mond holder to a straight line movement up the hollow gulde member when tmvehhg P or d th or down thereon.

As heretofore pointed out the slot in the The diamond 35 is mounted in a Suitable protecting sleeve is helical and the sides of Setting 52 which in turn is mounted in one of the connecting lug 36 are helical to con-ethe sockets 53 or 54 provided on opposite sides spond withthe sides ofthis slot/ The proof the diamond holder. The setting 52 of tecting sleeve is free to rotate within the the diamond may either be threaded into the As illustrated in cross section in Figure 4 llO determined position in thediamond holder Y socket or may be held in place therein by frictional engagement therewith.

, From the description of the parts of the apparatus and their movements it will be seen that on the rotation of the hand wheel the shaft 24 is rotated and with it the bevel pinion 23. The rotation of the bevel pinion 23 in turn causes the bevel pinion 22 to rotate and in doing so rotates the spindle 32 to move the diamond holder either up or down on the hollow guide member 28. The trunnion block 20 has thetrunnion pins 18 and'19 fixed therein by means of a drive fit but the same pins have a running fit in the trunnion bearings 16 and 17 so that the trunnion block 20 and the guide'member 28 can be swung into any angular position between the trunnion bearings. Bearing block 16 of the trunnion bearing is split on one side and a clamping screw55 is adapted to either draw the upper half of the bearing block down onto the trunnion pin and lock this pin and with it the trunnion block against rotation in the bearing or release this" pin and permit a free rotation therein to allow the pin and with it the trunnion block and guide member to swing into any desired angular position on the turn table 4.

For the purpose of turning the turn table 4 a handle 56 is provided. This handle is mounted to swing in the bifurcated lug 57 which projects radially from the turn table 4. The handle may thus be swung in either the horizontal or vertical position illustrated in the figures of the drawings. When in the horizontal position illustrated in dotted lines ,in Figure 1, the handle is used for turning the turn table after it has been released on the supportin base by the clamping screw 13, as above esoribed. The handle 56 has however anotherfunction, namely that'of a gauge' member for setting up the apparatus with relation to the grinding wheel which is tobe dressed. For this purpose the handle is swung into a vertical position as illustrated in full lines in Figure 1. In order to set the handle in a perfect vertical position the anvil 58 is provided. This anvil is mounted may in the lug 59 and serves as the stop for the adjusting screw 60 carried by the handle 56. The adjustingscrew is adjusted in the handle so that by bringing the end of the screw in contact with the face of the anvil 58 the handle is in a perf ect vertical position on the turn table and the distance X between the iddle of the guide member when in a vertiposition and the outside of the handle (as indicated in Figure 1 is a predetermined distance, usually three inches. The diamond thus be located on the magnet table of the grinder with relation to the grinding,

vwheelby measuring the distance from the wheel to the handle and then subtracting measurement of the-distance X.

As illustrated in Figure '1, the frustrated the .in order to have the diamond prescribe a corresponding arc and dress the wheel to form either a concave or convex face on the grinding wheel, depending on whether the diamond is located on one side or the other of the center of rotation of the turn table.

One half of one of the sides of the trunnion block is similarly divided into one hundred eighty degrees so that this block and with it the hollow guide member and diamond holder may be set in any angular position. By first setting the apparatus with relation to the grinding wheel and then giving the hollow guide member the desired angle the diamond holder is moved up and down on the guide member on the rotation of the hand wheel and will dress a corresponding angle on the grinding wheel when the diamond is bro'ughtin contact with the grinding wheel.

I claim:

1. A ,dressing apparatus for grinding wheels comprising a base, a turn table mounted on said base, a guide member mounted'to swing on said turn table, a damond holder mounted to slide on said guide member and means for moving said holder along said guide member at any angular position of said guide member.

2. A dressing apparatus for grinding wheels comprising a base, a turn table mounted on said base, a trunnion bearing carried on said base, a trunnion block, a pair of trunnion pins fixed in said trunnion block and projecting from said trunnion block, said trunnion pins being mounted-to turn in said trunnion bearing, a guide member projecting radially from said trunnion block, a diamond holder mounted to slide on said guide member mounted on said base, a trunnion bearing pro- .vided on said turn table, a trunnion block mounted in said trunnion bearing, a hollow guide member projecting radiall from said trunnion block, a threaded spin le mounted to rotate in said hollow gu de member, a diaguide Ill mond holder mounted to slide on the outside .of said guide member, a nut threaded on said threaded spindle and-means connecting said nut with said diamond holder to move said diamond holder on said guide member on the rotation of said threaded spindle.

4. A dress ng apparatus for grinding.

wheels comprising a base, a turn table mounted on said base, a trunnion bearing provided on said turn table, a trunnion block wheels comprising a base, a turn table mounted on said base, a trunnion bearing, a hollow guide member having a straight slot in one side of it projecting radially from said trunnion block, a protecting sleeve having a helical slot in the wall thereof mounted to rotate within said hollow guide member, a threaded spindle mounted to rotate within said protect ng sleeve, a bearing at the top and bottom of said hollow guide member for said threaded spindle, a nut threaded on said.

spindle, a diamond holder mounted to slide on the outside of said hollow guide member, a lug connecting said nut with said diamond holder by passing thru the straight and helical slot of said guide member and said protecting sleeve, the movement of said lug with said nut on the rotation of said spindle operating to turn said protecting sleeve to keep the straight slot in said hollow guide member covered above and below'said diamond holder.

6. In an apparatus for dressing grinding wheels the combination of a .base, a turn table mounted on said base, a guide member mounted to swing in a vertical plane on said turn table, a diamond holder mounted to slide on said guide member and means for sliding said diamond holder on said guide member? 7. In an apparatus for dressing grinding wheels the combination of a base, a turn table mounted to rotate on said base, a guide member mounted to swing in a vertical plane on said turn table, a diamond holder mounted on said guide member and a combined handle and gauge member mounted to swing on said turn table and forming a handle for rotating said turn table when in a horizontal position and forming a gauge member for the location of the diamond holder with relation to the grinding wheel when in a vertical position.

8. In an apparatus for dressing grinding wheels the combination of a base, a turn table mounted to rotate on said base, a guide member mounted to swing in a vertical plane on said turn table, a diamond holder mounted on said guide member and a combined handle and'gauge member mounted to swing 'on said turn table and forming a handle for rotating said turn table when in a horizontal position and forming a gauge member for the location of the diamond holder with relation to the grinding wheel when in a vertical position, and adjustable means for urresting the swinging movement of said handle in one direction.

9. In an apparatus for dressing grinding wheels the combination of a base, a trunnion block, a pair of trunnion pins projecting from said trunnion block with a space provided between said pins on the inside of said trunnion block, a shaft mounted centrally of said trunnion pins and extending through the space provided between said trunnion pins, means for rotating said shaft, :1 bevel gear carried on said shaft and located in the space between said trunnion pins, 9. spindle mounted to rotate in said trunnion block and extending into the space provided between said trunnion pins, a second bevel gear carried on the end of said spindle and meshing with said first bevel gear, said spindle being threaded, a nut threaded on said spindle, a protecting sleeve surrounding said nut and said spindle, a guide member anchored in said trunnion block and surrounding said protecting sleeve, a diamond holder mounted on said guide member and means connecting said nut with said diamond holder thru said protecting sleeve and guide member to move said diamond holder on said GEORGE WEIDNER. 

